Markdown Preview with Mermaid

Preview Markdown with Mermaid diagrams, inspect rendered HTML, review heading outline, and export polished docs from one browser-based workspace.

How to use

  1. Paste Markdown content or start from the sample document in the editor.
  2. Switch between preview, outline, rendered HTML, and error tabs to review the document.
  3. Export PNG or PDF, or copy rendered HTML when the draft is ready to share.

Benefits

  • Keeps Markdown text, Mermaid diagrams, and rendered output together in one review flow.
  • Surfaces parse issues before publishing internal docs, changelogs, and technical guides.
  • Supports browser-side export and copy workflows without sending content to a server.

Common uses

  • Preview engineering documentation and Mermaid diagrams before publishing.
  • Review heading structure with the built-in outline for longer Markdown documents.
  • Copy rendered HTML or export PDF snapshots for handoff, review, and sharing.

Markdown review tips

  • Use the outline tab to confirm heading order before sharing long technical documents.
  • Check the rendered HTML tab when you need paste-ready content for external editors.
  • Preview Mermaid diagrams in the same pass so flowcharts and sequence diagrams stay aligned with the text.

Sample Markdown

# Release Checklist

- Validate headings and links
- Preview Mermaid diagrams before publishing
- Export rendered HTML or PDF for review

```mermaid
flowchart LR
  Draft[Draft markdown] --> Review[Preview in browser]
  Review --> Publish[Publish docs]
```

Sample rendered HTML

<h1 id="release-checklist">Release Checklist</h1>
<ul>
  <li>Validate headings and links</li>
  <li>Preview Mermaid diagrams before publishing</li>
  <li>Export rendered HTML or PDF for review</li>
</ul>
<pre><code class="language-mermaid">flowchart LR
  Draft[Draft markdown] --&gt; Review[Preview in browser]
  Review --&gt; Publish[Publish docs]
</code></pre>

FAQ

Can this page preview Mermaid code fences inside Markdown?

Yes. Mermaid fences are rendered alongside headings, tables, lists, and code blocks so the final document layout is easier to review.

Can I copy rendered HTML or export this Markdown preview?

Yes. The route supports rendered HTML copy, PNG export, and PDF export directly in browser.

What to expect on this route

Use Markdown Preview + Mermaid when the goal is to review document structure, rendered output, and export readiness from the same browser-based editor before publishing.

When this route helps most

  • Review headings, links, and long-form Markdown structure before publishing docs or changelogs.
  • Preview Mermaid diagrams in the same pass as surrounding Markdown copy.
  • Generate export-ready HTML, PNG, or PDF output without moving the draft into another tool first.

What the preview renders

  • Standard Markdown elements such as headings, lists, tables, links, and fenced code blocks.
  • Mermaid code fences render inline when the browser runtime can support the diagram syntax.
  • The HTML tab exposes the rendered markup when you need paste-ready output for another editor.

Common preview issues

  • Malformed Mermaid syntax stays visible through guided warnings instead of raw runtime errors.
  • Broken heading structure is easier to catch from the outline tab before sharing a long document.
  • If export output looks off, recheck the rendered preview first so formatting issues are fixed before PDF or PNG generation.